77149998 has 48 divisors (see below), whose sum is σ = 172149120. Its totient is φ = 24957072.

The previous prime is 77149973. The next prime is 77149999. The reversal of 77149998 is 89994177.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77149999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203373 + ... + 203751.

It is an arithmetic number, because the mean of its divisors is an integer number (3586440).

Almost surely, 2^77149998 is an apocalyptic number.

77149998 is an abundant number, since it is smaller than the sum of its proper divisors (94999122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77149998 is a wasteful number, since it uses less digits than its factorization.

77149998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 690 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 77149998 is about 8783.5071583053. The cubic root of 77149998 is about 425.7081582423.

The spelling of 77149998 in words is "seventy-seven million, one hundred forty-nine thousand, nine hundred ninety-eight".